Muddy Ground, When OS 4.2 for the 8700 is release it will be as easy as downloading both OS 4.2 executable and Desktop Manager 4.2, installing both on your PC, then using Apps Loader to install it on your BB. No charge, and no real problem. As normal, before installing anything on your BB, you will want to do a backup before attempting the installation.
Hope this Helps
Rcbjr.